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wireSchemas() already advertised only run_code under mode: 'code', but the executor resolved every call through get(), which returns the full visible map plus the reserved transport. A model could name a native tool directly and bypass run_code entirely. Route the execution-path lookups through a new private resolveExecution() that applies the mode collapse at the operation boundary: model-direct calls under 'code' may only name run_code (UNKNOWN_TOOL otherwise), while SDK sub-dispatches (parent token set) keep every visible tool. get()/schemas() public semantics are unchanged. The denial happens at createExecution, before the extensible policy pipeline — pre-execute listeners, approval ask, and guards never observe a call that is deterministically denied. A collapsed call honors the pre-dispatch cancellation contract, routes aborted results through the visible tool's finalizeContent, and captures the finalizer before argument materialization. Regenerated docs, catalogs, graphs, scoped events, re-recorded translation pairs, and updated test assertions. Fixes #1815